Here's some of what I know about the Swamp Fox and the DuBose family.
1.The current entrances to their former plantations in Berkeley County, SC are only about a mile apart.There is a sign on highway 45 west of Pineville indicating the tomb of Francis Marion.There are several other graves as well as Francis Marion's, one being a DuBose, but I don't recall the first name.Just east of Marion's is Oakland Hunting Club.It is made up of Bluford and Milford, once DuBose Plantations.Isaac DuBose III and his wife Catharine Boisseau are buried there.They are my 5G-grandparents.
2.I found the following at the Huguenot Society of SC in Charleston.South Carolina Genealogies Article From the South Carolina Historical (& Genealogical) Magazine, Volume II, page 27:
6. Esther Cordes (2,1) was born in Carolina about 1695.She married between 1711 and 1716, Gabriel Marion, son of Benjamin Marion, the emigrant, and his wife Judith Baluet.He was born 1690-95 and died between 1747 and 1751.Children:
15. IEsther Marion
16. IIIsaac Marion
17. III Gabriel Marion
18. IVBenjamin Marion
19. VJob Marion
20. VIFrancis Marion - the Swamp Fox
She died between October 7, 1757, when her will was made and January 28, 1758 when it was proved.
3.From Reminiscences of St. Stephen's Parish, Craven County and Notices of Her Old Homesteads by Samuel DuBose originally printed in 1887, I have the following:
2. The next plantation was Burnt Savanna, now a part of Belle Isle.For some time before the revolution this place was the residence of General Marion, and in its retirement he probably prepared himself for the part he was to act in that stormy period.He married late in life Mary Videau, and died childless in 1795.
3. The third plantation, "Belle Isle," was the residence of Robert Marion, Esq.He was the third son of Gabriel Marion and Catharine Taylor.His brothers, Gabriel and Benjamin, never married.Of his sisters, Catharine died unmarried; his younger sister, Charlotte, married Anthony Ashby, by whom she had a daughter, who married Richard Singleton, and after Mr. Ashby's death she married Theodore S. Marion, by whom she had a daughter, who, in 1808, became the wife of the writer.Mr. Robert Marion married Mrs. Esther Deveaux (nee Gignilliat), mother of the late Stephen G. Deveaux.This marriage produced no children.
7. Blueford was formerly the residence of Philip Williams, who, removing to York, sold it to Peter Sinkler.By him it was left to his son Peter, who, dying childless, bequeathed it to the children of his sister Elizabeth, wife of Samuel Dubose.It was the residence of the late Col. William Dubose, her second son, and is now that of Julius Dubose, his nephew and her grandson.
8.North of Blueford was Milford, the residence of Isaac Dubose, who left it to his eldest son, Isaac, by whom it was sold to Samuel Cordes.The elder Isaac Dubose married Miss Boisseau, by whom he had three sons and two daughters, viz.: Isaac, who married Mary Dutart; David, who married Elizabeth Moncrieff; and Samuel, who married Elizabeth Sinkler.His daughter Joanna married David Gaillard of White Plains; his other daughter, Catharine, died unmarried.
15. West of Pole Bridge is Murrell's, called by the name of the original owner; it passed into the hands of John Frierson, and was afterwards owned and settled by Samuel Dubose, son of Isaac, of Milford.Mr. Dubose married first Elizabeth, daughter of Peter Sinkler, and had four children, viz.: Samuel, who married Eliza Marion, and after her death Ann P. Stevens; William, who married Laura Stevens; Elizabeth, who married Colonel Thomas Porcher; and Anna Maria, wife of William Cain.After the death of Elizabeth Sinkler, Mr. Dubose married Mrs. Martha White, and had Isaac, who married Marianne Porcher; Martha, the wife of Peter Porcher of Tibbekudlaw; and Louisa, wife of David Gaillard, late of Fairfield.
You may also want to check the DuBose Genealogy compiled by Dorothy Kelley MacDowell for leads.It does not contain a bibliography.Some people report that the information for their line is 100% correct and others that it is 100% wrong.
Hope this helps.